If we really want to talk about ways in which people will stop listening to other and follow that to its natural conclusion, the best way of doing that is to delegitimize what they are saying. And what is the biggest way to do that? To stop giving them big platforms to say it. To make them have to go stand on street corners and shout like all the other crazies who are saying shit like the Lizard people are coming.
Of course, doing that is incredibly hard in the era of the internet and Fox News and 'both sides are tots the sames, guy, cross my heart' reporting on TV, but still, that's the best way to get people, in mass, to stop listening to others. Debating them away only work when those people actually care about debate, and Lord, if it's anything that the last few years have proven it's that they don't give two shits about that. It's like some of you are playing Yahtzee when these people are telling you they are going to play something else right to your face, and you just hope intense Yahtzee will make them suddenly lose at Yahtzee.